Social Security Handbook

The simplified old-start formula is used to figure the AME and
the Primary Insurance Benefit (PIB). It is used if an individual
meets the requirements for its use and if it produces a higher PIA
than the AME or AIME formula.

Under the simplified old-start formula, your earnings for 1937
through 1950 are considered a single total amount. This total amount
is allocated equally to each of those years (1937-1950). These years
are used along with years after 1950 to determine your average earnings.

This formula considers computation and elapsed years in the
usual way (§§703-704) except that years are counted from after 1936 instead of after
1950. Base years, however, are determined differently as explained
in §705.

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